JPS5816130Y2 - color picture tube - Google Patents

Description

[Detailed description of the invention] The present invention is a shadow mask type color picture tube, in particular, a contact spring that electrically connects the mask frame to a conductive film attached to the inner wall of the bulb funnel part. This relates to the securing structure.

In general, a shadow mask type color picture tube is constructed as shown in FIG. It includes a metal back 8, a conductive film 9, and the like.

However, the mask frame 4 is elastically attached to the face panel portion of the valve 1 by three or four metal springs 10 attached to the outer surface of the side illumination, and metal pins 11 embedded in the valve 1, and the funnel of the valve 1 A conductive film 9 attached to the inner surface of the valve funnel is electrically connected to an anode button terminal 12 buried in the valve funnel.

Further, the mask frame 4 and the magnetic shield body 5 are connected to each other by a large number of classical pins 13 that pass through the bottom walls of both, and the contact springs 6 and the mask frame 4 are connected to each other by X marks in FIG. Spot welded at the weld points shown.

In the operation of the color picture tube constructed in this way,
The DC high voltage applied to the anode button terminal 12 is applied to the conductive film 9,
In addition to being applied to the shadow mask 3 through the contact spring 6 and the mask frame 4, it is also applied to the metal back 8 from the mask frame 4 through the spring 10 and the valve-embedded metal pin 11, so that the inner surface of the face panel portion and the inner surface of the funnel portion of the valve 1 are at an equal potential. It is maintained.

By the way, the contact spring 6 and the magnetic shield body 5
Since these are useless at the stage where the fluorescent film 7 is formed by repeated exposure and development, they are installed inside the face panel section after the fluorescent film 7 and the metal back 8 are formed. It is common practice to attach a shadow mask to a mask frame with a shadow mask.

For this reason, the contact spring 6 is connected to the mask frame 4.
There was a risk that the shadow mask 3 would be clogged or deformed due to sparks generated during the process of spot welding, contact with the welding rod, etc., and there was also a risk that the fluorescent film 7 would be damaged.

The present invention has been devised to eliminate the above-mentioned drawbacks of the conventional art.Next, a color picture tube of the present invention will be explained along with embodiments shown in the drawings.

In FIGS. 3 and 4, contact spring 1
4 has a rectangular hole 16 in its fixed edge 15, and cut-and-raised portions 17 and 18) are formed on the two long sides of the hole 16 to form a mask frame L/-me 19. It protrudes to the side and is fitted into a rectangular hole 21 formed in the bottom wall 20 of the mask frame 19 .

Therefore, on the bottom wall 20 of the mask frame 19, the fixed edge 15 of the contact spring 14 and the bottom wall 22 of the magnetic shield 5 are inserted into the respective rectangular holes 21, 16, 2.
3 are stacked in a coaxial position, and the clamp pin 13 is press-fitted into the hole penetrating the laminated portion, not only the mask frame 19 and the magnetic shield body 5 are coupled to each other, but also the contact spring 14 is coupled together. This eliminates the need for welding the contact spring 14 to the mask frame 19.

The mask frame 19 and the magnetic shield body 5 are conventionally connected by a large number of clamp pins, but in the present invention, one of the clamp pins is used, and a cut-out part formed around the hole of the contact spring 14 is used. Part 1
7.18 is fitted into the hole 21 of the mask frame 19, so even if a strong force is applied to the contact spring 14 from the outside, the contact spring 14 will not rotate or move at its fixed edge 15, or fall off. Not at all.

Further, there is an advantage that the raised portions 17, 18 facilitate press-fitting of the clamp pin 13.

In the embodiment described above, a rectangular hole 16 was formed in the fixed end edge 15 of the contact spring 14, and cut-out portions 17 and 18 were formed on two long sides of the hole 16, but as shown in FIG. , cut and raised portions 17' and 18' on the two short sides of the rectangular hole 16.
may be formed.

Further, the holes 16.21 may be non-circular, and the holes 22 are not limited to a rectangular shape either.

As described above, in the color picture tube of the present invention, the fixed edges of the contact springs are stacked on the bottom wall of the mask frame, and the cut-out portions formed around the holes of the fixed edges are formed on the bottom wall. A contact is formed by fitting a clamp pin into a non-circular hole, and inserting a clamp pin into a hole in the bottom wall of the magnetic shield stacked on the fixed end, a hole in the fixed end edge, and the non-circular hole. The spring can be fixed to the mask frame without welding and at a very low cost.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of a conventional color picture tube, Fig. 2 is a partial perspective view of the same color picture tube, and Fig. 3 is an exploded perspective view of the main parts of a color picture tube implementing the present invention. FIG. 4 is a perspective view of the same essential parts, and FIG. 5 is a partial perspective view of a contact spring according to another embodiment of the present invention. 1...Pulp, 3...Shadow mask, 4.19...Mask frame, 5...
・Magnetic shielding body, 6゜14...Contact spring, 9...Conductive film, 13...Clamp pin, 15...Fixed edge of contact spring , 16.21.23... Hole, 17゜1
8.17', 18'... cut-and-raised parts.

Claims (1)

[Scope of utility model registration request] The fixed edges of the contact springs are stacked on the bottom wall of the mask frame, and the cut-out portion formed at the periphery of the hole of the fixed edge is fitted into the non-circular hole formed in the bottom wall, and the fixed edge A color picture tube characterized in that clamp pins are inserted through holes in the bottom wall of the magnetic shield stacked on the edges, holes in the fixed edge, and the non-circular holes.